Dynamo-electric machine.



R. E. HELLMUND.

DYNAMO ELECTRIC MACHINE,

APPLICATION man APR. l.' |915.

1 26 1, 1 26.. Patented Apr. 2, 1918.

gl Il wlTNEssl-:s l j f -ugw y UNITED STATES PATENT OFFICE.

RUDOLF E. HELLIUNILOF PITTSBURGH, PENNSYLVANIA, ASSIGNOR T WESTINGHOUSEELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent.

Patented Apr. 2, 1918.

Application led April 1, 1915. Serial No. 18,507.

To all whom 'it may concern:

Be it known that I, RUDOLF E. HELL- MUND, a subject of the Emperor ofGermany, and a resident of Pittsbur h, in the county of Allegheny andState o Pennsylvania, have invented a new and useful Improvement inDynamo-Electric Machines,

` of which the following is-a specification.

duct.

My invention relates to magnetizable core members for dynamo-electricmachines and it has particular reference to machines provided withlongitudinal ventilating ducts.

In Va copending application, Serial No. 15,800, fledMarch 20, 1915, byR. E. Hellmund and J. V. Dobson and assigned to the WestinghouseElectric & Manufacturing Company, is described a system of ventilationfor dynamo-electric machines in which the cooling medium enters themachine at each end and is expelled from a central duct. In thisconstruction, the magnetizable core members are built up in separatesections between end members and are secured together by suitable means.

The object of my invention is to provide means whereby a portion of thecooling medium ma be passed through the core members an expelleddirectly into the surrounding atmosphere without passing into thecentral d uct embodied in the above-de scribed machine.

By the use of my invention in connection with machines of this type, thecentral duct may be reduced in width, thereby limiting the amount ofinactive copper brldging the ducts, as well as decreasing the copperlosses. It will also be vpossible to obtain greater mechanical strengthfor the core structure, as a whole, for the reason that the number ofVentilating openings in the end plates is materially reduced. In thelatter case, more metal is available in the end members to give therequired rigidit to the structure than would be the case i all of theaxial ventilatinglducts opened into the central Furthermore, myinvention is particularl applicable to machines designed for rai wayservice wherein it is yessential to obtain eective ventilation withoutincreasing the length of the machines. It is to be understood, however,that my invention may be readily applied to dynamo-electric machines ofany type.

of the magnetizable core member of a dynamo-electric machine embodyingmy invention; Figs. 2, 3 and 4 are fragmentary views, respectively, ofthe several types of sheet-metal punchings employed in constructing thecore member shown in Fig. 1.

Groups of sheet-metal punchings 1, 2 and 3 are assembled betweensuitable end members 4 to form separate half portions of a magnetizablecore member. The half portions are spaced apart to form a central duct 5and are secured together by any suitable means, such as lugs 6 carriedby the end members 4 and bolts 7. The sheet-metal `plates 1, 2 and 3 areannular in form and are provided, adjacent to their outer peripheries,with a plurality of regularly spaced rivet holes 8. The plates 1 arefurther provided with a plurality of openings 9, preferably circular inform and arranged in staggered relation to the openings 8, and theplates 2 are provided with a plurality of substantially U-shaped slots10 opening into the outer peripheries of the plates and so arranged thatthe bottom portions of the slots 10 are adapted to register with theopenings 9 in the lates l, when the plates 1 and 2 are assemb ed. Theplates 1, 2 and 3 are provided with additional openings 11 which areregularly spaced with respect to each other. When the plates areassembled, the rivet holes 8 are in alinement and are adapted to receivesuitable rivets 12 by means of which the plates are secured between theend members 4. The circular openings 9 are also in alinement andregister with the bottom portions of the slots 10 to form a plurality ofcontinuous longitudinal and radial ducts 13 by means of which a coolingmedium may be forced from the outside of the machine through theopenings 13n provided in the plate member 4 and expelled directly intothe surrounding atmosphere. The additional openings 11 are also inalinement and form a plurality of longitudinal ducts 14 which open intothe central ventilatin duct.5 by means of openings 15 provided 1n theend members 4.

From the foregoing, it is apparent that, although a large proportion ofthe cooling medium will be forced through the longitudinal ducts 14 andinto the central duct 5 between the end members 4, the portion of thecooling medium which traverses the core member adjacent to its outerperiphery will is qulte evident that the dimensions of the.

4 central duct may be reduced, and, if so desired, may be entirelydispensed with. In addition, the' end members will not be weakened byproviding additional openings in order to furnish an outlet for thecircular openings 9 in the plates 1.

While I. have shown my invention in a simple and preferred form, itis'not so limited but may be applied to dynamo-electric machines otherthan of the type illustrated and I desire that only such limitationsshall be imposed thereon as come within the scope of the appendedclaims.

I claim as my invention:

1. An annular magnetizable core member for dynamo-electric machinesprovided with a plurality of longitudinal ducts extending therethroughand a plurality of continuous longitudinal and radial ducts extendingpartially through said member.

2. An annular magnetizable core member for dynamo-electric machinesprovided with a plurality of longitudinal ducts extending therethroughvand a plurality of substantially L-shaped ducts.

3. An annular magnetizable core member for dynamo-electric machinesprovided with a plurality of longitudinal ducts extending from end toend and a plurality of continuous longitudinal and radial ductsextending from one end to the outer periphery of said member.

4. An annular 'magnetizable core member for dynamo-electric machinescomprising a plurality of plates and end members secured together,longitudinal ducts extending through said plates and end members andother ducts extending only through one of said end members and through aportion of said plates.

5. An annular magnetizable core member for dynamo-electric machinescomprising a plurality of plates and end members secured together,longitudinal ducts extending through said plates and end members andother continuous longitudinal and radial ducts extending through one ofsaid end members and through a portion of said plates.

6. An annular magnetizable core memberV for dynamoelectric machinescomprising a plurality of plates and end members secured together,longitudinal ducts extending through said platesf and end members andother ducts extending through one of said plate members to the outerperiphery of said core member.

7 An annular magnetizable core member for dynamo-electricmachinescomprising a plurality of plates provided with longitudinal ducts, endmembers provided with openings registerin with only a portion of saidlongitudinal ucts, and radial ducts provided in said platescommunicating with the remainder of said longitudinal ducts.

'8. An annular magnetizable core member for dynamo-electric machinescomprising a plurality of plates provided with longitudinal ducts, anend member provided with openings registering with all of saidlongitudinal ducts, a second end member provided with openingsregistering with only a portion of said longitudinal ducts, and radialducts provided in said plates and communicating with the remainder ofsaid ducts.

In testimony whereof I have hereunto subscribed my name this 29th day ofMarch,

RUDOLF E. HELLMUND.

